如何浏览文本字段（下一个/完成按钮） [英] How to navigate through textfields (Next / Done Buttons)

问题描述

如何使用iPhone键盘上的下一步按钮浏览所有文本字段？

How can I navigate through all my text fields with the "Next" Button on the iPhone Keyboard?

最后一个文本字段应关闭键盘。

The last text field should close the Keyboard.

我已经设置了IB按钮（下一个/完成）但现在我卡住了。

I've setup the IB the Buttons (Next / Done) but now I'm stuck.

我实现了textFieldShouldReturn操作，但现在Next和Done按钮关闭键盘。

I implemented the textFieldShouldReturn action but now the Next and Done Buttons close the Keyboard.

推荐答案

在Cocoa for Mac OS X中，你有下一个响应者链，您可以在文本字段中询问下一步应该关注哪个控件。这就是使文本字段之间的标签工作的原因。但是由于iOS设备没有键盘，只有触摸，这个概念在过渡到Cocoa Touch后还没有幸存下来。

In Cocoa for Mac OS X, you have the next responder chain, where you can ask the text field what control should have focus next. This is what makes tabbing between text fields work. But since iOS devices do not have a keyboard, only touch, this concept has not survived the transition to Cocoa Touch.

无论如何，这可以轻松完成，有两个假设：

This can be easily done anyway, with two assumptions:

1. 所有tabbable UITextField s位于同一父视图中。


2. 他们的tab-order由标签属性定义。

1. All "tabbable" UITextFields are on the same parent view.
2. Their "tab-order" is defined by the tag property.

假设你可以覆盖textFieldShouldReturn：as this：

Assuming this you can override textFieldShouldReturn: as this:

-(BOOL)textFieldShouldReturn:(UITextField*)textField
{
  NSInteger nextTag = textField.tag + 1;
  // Try to find next responder
  UIResponder* nextResponder = [textField.superview viewWithTag:nextTag];
  if (nextResponder) {
    // Found next responder, so set it.
    [nextResponder becomeFirstResponder];
  } else {
    // Not found, so remove keyboard.
    [textField resignFirstResponder];
  }
  return NO; // We do not want UITextField to insert line-breaks.
}

添加更多代码，也可以忽略这些假设。

Add some more code, and the assumptions can be ignored as well.

Swift 4.0

 func textFieldShouldReturn(_ textField: UITextField) -> Bool {
    let nextTag = textField.tag + 1
    // Try to find next responder
    let nextResponder = textField.superview?.viewWithTag(nextTag) as UIResponder!

    if nextResponder != nil {
        // Found next responder, so set it
        nextResponder?.becomeFirstResponder()
    } else {
        // Not found, so remove keyboard
        textField.resignFirstResponder()
    }

    return false
}

如果文本字段的超级视图是UITableViewCell，那么下一个响应者将是

let nextResponder = textField.superview?.superview?.superview?.viewWithTag(nextTag) as UIResponder!

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